boards: nxp: frdm_mcxn947: add mikrobus labels

Added mikrobus_i2c, mikrobus_spi and mikrobus_header node labels
to FRDM-MCXN947 device tree board definition, allowing compatible
shield boards to be used. Also add new FlexComm SPI pinmux for the
LPSPI6 on LPFLEXCOMM6 and enable required GPIO3 and GPIO5.

Signed-off-by: Stephan Linz <[email protected]>

Author: rexut

boards/nxp/frdm_mcxn947/frdm_mcxn947-pinctrl.dtsi

@@ -18,6 +18,18 @@
 		};
 	};
 
+	pinmux_flexcomm6_lpspi: pinmux_flexcomm6_lpspi {
+		group0 {
+			pinmux = <FC6_P0_PIO3_20>, /* SAI1_TXD0 */
+				 <FC6_P1_PIO3_21>, /* SAI1_RXD0 */
+				 <FC6_P2_PIO3_22>,
+				 <FC6_P3_PIO3_23>;
+			slew-rate = "fast";
+			drive-strength = "low";
+			input-enable;
+		};
+	};
+
 	pinmux_flexcomm2_lpi2c: pinmux_flexcomm2_lpi2c {
 		group0 {
 			pinmux = <FC2_P0_PIO4_0>,

boards/nxp/frdm_mcxn947/frdm_mcxn947.dtsi

@@ -61,6 +61,25 @@
 		};
 	};
 
+	mikrobus_header: mikrobus-connector {
+		compatible = "mikro-bus";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map = /* ANA_4/ADC1_A0      AN */
+			   <1 0 &gpio1 3 0>,  /* RST */
+			   <2 0 &gpio3 23 0>, /* CS */
+			   <3 0 &gpio3 21 0>, /* SCK */
+			   <4 0 &gpio3 22 0>, /* MISO */
+			   <5 0 &gpio3 20 0>, /* MOSI */
+			   <6 0 &gpio3 19 0>, /* PWM */
+			   <7 0 &gpio5 7 0>,  /* INT */
+			   <8 0 &gpio1 16 0>, /* GPIO, Not a RX */
+			   <9 0 &gpio1 17 0>, /* GPIO, Not a TX */
+			   <10 0 &gpio1 1 0>, /* SCL */
+			   <11 0 &gpio1 0 0>; /* SDA */
+	};
+
 	arduino_header: arduino-connector {
 		compatible = "arduino-header-r3";
 		#gpio-cells = <2>;
@@ -118,6 +137,13 @@
 
 arduino_spi: &flexcomm1_lpspi1 {};
 
+&flexcomm6_lpspi6 {
+	pinctrl-0 = <&pinmux_flexcomm6_lpspi>;
+	pinctrl-names = "default";
+};
+
+mikrobus_spi: &flexcomm6_lpspi6 {};
+
 nxp_8080_touch_panel_i2c: &flexcomm2_lpi2c2 {
 	pinctrl-0 = <&pinmux_flexcomm2_lpi2c>;
 	pinctrl-names = "default";
@@ -126,6 +152,14 @@ nxp_8080_touch_panel_i2c: &flexcomm2_lpi2c2 {
 
 arduino_i2c: &flexcomm2_lpi2c2 {};
 
+&flexcomm3_lpi2c3 {
+	pinctrl-0 = <&pinmux_flexcomm3_lpi2c>;
+	pinctrl-names = "default";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+};
+
+mikrobus_i2c: &flexcomm3_lpi2c3 {};
+
 &flexcomm2_lpuart2 {
 	current-speed = <115200>;
 	pinctrl-0 = <&pinmux_flexcomm2_lpuart>;

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.dtsi

@@ -56,22 +56,36 @@
 	status = "okay";
 };
 
-&gpio4 {
+/* Required on MikroBus connector. */
+&gpio5 {
 	status = "okay";
 };
 
-&gpio1 {
+/* Required on Arduino connector. */
+&gpio4 {
 	status = "okay";
 };
 
-&gpio0 {
+/* Required on MikroBus connector. */
+&gpio3 {
 	status = "okay";
 };
 
+/* Required on SD card. */
 &gpio2 {
 	status = "okay";
 };
 
+/* Required on Arduino and MikroBus connector. */
+&gpio1 {
+	status = "okay";
+};
+
+/* Required on Arduino connector. */
+&gpio0 {
+	status = "okay";
+};
+
 &green_led {
 	status = "okay";
 };
@@ -92,38 +106,63 @@
 	status = "okay";
 };
 
+/* Required on Arduino connector. */
 &flexcomm1_lpspi1 {
 	status = "okay";
 };
 
+/*
+ * LPFLEXCOMM supports UART and I2C on the same instance, enable this for
+ * LPLEXCOMM2 with LPUART2 and LPI2C2.
+ */
 &flexcomm2 {
 	status = "okay";
 };
 
+/* Required on Arduino and FlexIO LCD (touch panel) connector. */
 &flexcomm2_lpi2c2 {
 	status = "okay";
 };
 
-/*
- *LPFLEXCOMM supports UART and I2C on the same instance, enable this for
- * LFLEXCOMM2
- */
+/* Required on Arduino connector. */
 &flexcomm2_lpuart2 {
 	status = "okay";
 };
 
+&flexcomm3 {
+	status = "okay";
+};
+
+/* Required on MikroBus connector. */
+&flexcomm3_lpi2c3 {
+	status = "okay";
+};
+
 &flexcomm4 {
 	status = "okay";
 };
 
+/* Required for serial console and on Camera connector. */
 &flexcomm4_lpuart4 {
 	status = "okay";
 };
 
+/*
+ * LPFLEXCOMM6 supports SPI for MikroBus. Enable this for LPSPI6 but let
+ * LPSPI6 disabled as long as it is not needed because of two shared signals
+ * with SAI1 (P3_20 for SAI1_TXD0 and FC6_SPI_MOSI and P3_21 for SAI1_RXD0
+ * and FC6_SPI_SCK). There is also an additional MikroBus signal shared
+ * with SAI1 (P3_19 for SAI1_RX_FS and MikroBus:PWM).
+ */
+&flexcomm6 {
+	status = "okay";
+};
+
 &flexcomm7 {
 	status = "okay";
 };
 
+/* Required on Camera connector. */
 &flexcomm7_lpi2c7 {
 	status = "okay";
 };